json - 如何在 groovy 中使用 JSONObject 和 JSONArray 类？没有在终端上收到 "unable to resolve class JSONObject"错误

Question

我正在尝试使用 JSONObject 和 JSONArray 类创建一个 json 对象(从根到叶节点)并以 json 格式从我在 groovy 中的子兄弟树结构递归打印，但我不断收到“无法解析类 JSONObject”错误。我的代码片段如下:

void screenout(Nope roota, Map mapp) {
    me = roota;
    Nope temp = roota;
    if (roota == null)
        return;
    def rootie = new JSONObject();
    def infos = new JSONArray();
    while (temp != null) {
        def info = new JSONObject();
        info.put("category", temp.val)
        info.put("path", mapp[temp.val])
        infos.add(info);
        roota = temp;
        temp = temp.sibling;
        screenout(roota.child, mapp);
    }
    rootie.put("children", infos);

    if (me == root) {
        println(rootie.JSONString());
    }
}

Answer 1

所以，给定:

class Node {
   String category
   List children
}

def tree = new Node(category:'a', children:[
    new Node(category:'ab'),
    new Node(category:'ad', children:[
        new Node(category:'ada')
    ])
])

我只能这样做:

import groovy.json.*

println new JsonBuilder(tree).toPrettyString()

打印出来:

{
    "category": "a",
    "children": [
        {
            "category": "ab",
            "children": null
        },
        {
            "category": "ad",
            "children": [
                {
                    "category": "ada",
                    "children": null
                }
            ]
        }
    ]
}